Help Python (Parameters)

Hi, I have a little problem, and I hope you guys will be able to help me :]

My goal is make a parameters that will '' search '' in a field (name of a street) in a csv file.

Python doesn't seem to recognize the string parameter.

Here is my code:


road_name = arcpy.GetParameterAsText(0)
arcpy.AddMessage (road_name) just to see if it works (and it doesn't)

f5_in = open (ROAD,'r') ROAD is my csv file
f5_in.readline()


for ligne in f5_in:
lecture = extraction(ligne) split on my csv file and put it in 4 index
if lecture[4].upper()== road_name.upper():
arcpy.AddMessage("YOUR ROAD IS ON THE LIST")
break

if road_name.upper() != lecture[4].upper():
arcpy.AddMessage("YOUR ROAD IS NOT ON THE LIST")

f5_in.close()




Overall it worked fine when I used Raw_input, and now that I use GetParameterAsText nothing work.

How can I solve this problem ?

Thank you !